ios release build

engine/Build.bee.cs

                 "src/shell/platform/unity/darwin/ios/cocoa_task_runner.h",
                 "src/shell/platform/unity/darwin/ios/unity_surface_manager.mm",
                 "src/shell/platform/unity/darwin/ios/unity_surface_manager.h",
-                "src/shell/platform/unity/darwin/ios/device_screen.mm",
         };
 
         np.Sources.Add(c => IsWindows(c), winSources);
         np.Libraries.Add(IsIosOrTvos, c => {
             return new PrecompiledLibrary[]
             {
-                new StaticLibrary(flutterRoot+"/out/ios_debug_unopt/obj/flutter/third_party/txt/libtxt_lib.a"),
                 new SystemFramework("CoreFoundation"),
                 new SystemFramework("ImageIO"),
                 new SystemFramework("MobileCoreServices"),

com.unity.uiwidgets/Runtime/Plugins/ios/device_screen.mm

+#import <UIKit/UIKit.h>
+#import "uiwidgets_device.h"
+
+extern "C"
+{
+  float IOSDeviceScaleFactor()
+  {
+    float scale = [[UIScreen mainScreen] scale] * 1.0;
+    if ([UIWidgetsDevice NeedScreenDownSample]) {
+      scale *= 0.8696;
+    }
+    return scale;
+  }
+}

com.unity.uiwidgets/Runtime/Plugins/ios/device_screen.mm.meta

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